To setup cron for IOS script in MAC

The cron syntax is:

# +---------------- minute (0 - 59)
# |  +------------- hour (0 - 23)
# |  |  +---------- day of month (1 - 31)
# |  |  |  +------- month (1 - 12)
# |  |  |  |  +---- day of week (0 - 6) (Sunday=0 or 7)
# |  |  |  |  |   
  *  *  *  *  *  command to be executed

Issue this command crontab -e and put this */15 * * * * /path/to/script in it. */15 means every 15 minutes...